CN103581944B - Ultrahigh speed random access processing method, Apparatus and system - Google Patents

Ultrahigh speed random access processing method, Apparatus and system Download PDF

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CN103581944B
CN103581944B CN201210278680.4A CN201210278680A CN103581944B CN 103581944 B CN103581944 B CN 103581944B CN 201210278680 A CN201210278680 A CN 201210278680A CN 103581944 B CN103581944 B CN 103581944B
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sequence
detection
window
ith
peak value
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CN103581944A (en
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万莉
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201210278680.4A priority Critical patent/CN103581944B/en
Priority to PCT/CN2013/076974 priority patent/WO2014023125A1/en
Priority to JP2015524607A priority patent/JP6155518B2/en
Priority to EP13828176.1A priority patent/EP2866512B1/en
Publication of CN103581944A publication Critical patent/CN103581944A/en
Priority to US14/600,615 priority patent/US9674872B2/en
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Priority to US15/601,703 priority patent/US10039133B2/en
Priority to US16/026,830 priority patent/US10485031B2/en
Priority to US16/663,043 priority patent/US10827533B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • H04J13/0062—Zadoff-Chu
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J2011/0096—Network synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0838—Random access procedures, e.g. with 4-step access using contention-free random access [CFRA]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of ultrahigh speed random access processing method, Apparatus and system, described method includes: according to cell type and the first cyclic shift parameter Ncs, choose ZC sequence set, arranges N number of detection window, N >=5 for ZC sequence each in described ZC sequence set；Send described cell type, the 2nd Ncs and described ZC sequence set to user equipment (UE)；Receive the accidental access signal that described UE sends, from described accidental access signal, obtain described random access sequence；Described random access sequence is done relevant treatment with each ZC sequence in described ZC sequence set respectively, effective peak is detected in N number of detection window of described each ZC sequence, the estimated value of round trip transmission delay RTD is determined according to described effective peak, solve the problem being difficult to correctly detect round trip transmission delay under ultrahigh speed scene, improve network access performance.

Description

Ultrahigh-speed random access processing method, device and system
Technical Field
The present invention relates to mobile communication systems, and in particular, to a method, an apparatus, and a system for processing ultra-high speed random access.
Background
In a Long Term Evolution (LTE) system, a Random Access Channel (RACH) is mainly used for a User equipment (User)Equipment, UE) that does not carry any user data. The signal transmitted by the UE on the RACH channel is a Preamble sequence, which is Zadoff-Chu sequence (ZC sequence). In the prior art, the Preamble may include a segment of length TCPA Cyclic Prefix (CP) and a length TSEQTwo parts of the access Sequence (SEQ). Meanwhile, for parameter settings of preambles of several different formats, different cell radii can be matched, as shown in table 1:
TABLE 1
Wherein, TsIs the basic time unit, T, in the LTE protocols＝1/(15000×2048)s。
In the prior art, an LTE system optimizes a low-speed scene of 0-15 km/h, so that the LTE system still has high performance in a high-speed moving scene of 15-120 km/h, and can still keep connection in a high-speed moving scene of 120-350 km/h. In the existing LTE protocol, two cell configurations, namely an unrestricted cell and a restricted cell, are supported, where the unrestricted cell is applied in a low frequency offset scenario (for example, the frequency offset is less than 600Hz), and the restricted cell is applied in a large frequency offset scenario (for example, the frequency offset is greater than 600 Hz). For the restricted cell, when the random access signal sent by the UE adopts a ZC Sequence (Zadoff-Chu Sequence) as the random access Sequence, an evolved node B (evolvedNode B, NodeB or eNB or e-NodeB) can be guaranteed to be in the frequency offset rangeInner correct detection of Round Trip Delay (RTD), where Δ fRAThe time Advance value (Timing Advance, TA) is adjusted by the UE according to the RTD, so that the sending time of the message is adjusted, and the UE can be ensured to be normally accessed to the network.
With the development of communication technology and the improvement of communication requirements of users, operators put forward the covering requirements of ultra-high speed mobile scenes (800-1200 km/h) and high-frequency band high-speed railway scenes. Under the two scenes, the frequency deviation of the random access signal is larger, namelyW is larger than or equal to 5, and the eNB is difficult to ensure the accuracy of RTD detection under large frequency offset, so that the normal access of the UE to the network is difficult to ensure, and the access performance of the network is influenced.
Disclosure of Invention
The embodiment of the invention provides a method, a device and a system for processing ultra-high-speed random access, which enable user equipment to normally access a network in an ultra-high-speed mobile scene and improve the network access performance.
One aspect of the present invention provides a method for processing ultra-high speed random access, including: selecting a ZC sequence group according to the type of the cell and a first cyclic shift parameter Ncs, and setting N detection windows for each ZC sequence in the ZC sequence group, wherein N is more than or equal to 5; sending the cell type, the second Ncs and the ZC sequence group to User Equipment (UE), so that the UE selects a random access sequence in the ZC sequence group; receiving a random access signal sent by the UE, and acquiring the random access sequence from the random access signal; and respectively carrying out correlation processing on the random access sequence and each ZC sequence in the ZC sequence group, detecting effective peaks in N detection windows of each ZC sequence, and determining an estimated value of the RTD (round trip delay) according to the effective peaks.
Another aspect of the present invention provides an ultra high speed random access processing apparatus, including: a selecting unit, configured to select a ZC sequence group according to a cell type and a first cyclic shift parameter Ncs; the setting unit is used for setting N detection windows for each ZC sequence in the ZC sequence group selected by the selection unit, wherein N is more than or equal to 5; a sending unit, configured to send the cell type, the second Ncs, and the ZC sequence group selected by the selecting unit to user equipment UE, so that the UE selects a random access sequence in the ZC sequence group; a receiving unit, configured to receive a random access signal sent by the UE, and obtain the random access sequence from the random access signal; and the detection unit is used for respectively carrying out correlation processing on the random access sequence acquired by the receiving unit and each ZC sequence in the ZC sequence group, detecting effective peak values in N detection windows set for each ZC sequence by the setting unit, and determining an estimated value of the RTD (round trip delay) according to the effective peak values.
According to the technical scheme, by adopting the embodiment of the invention, the ZC sequence group is selected according to the cell type and the first cyclic shift parameter Ncs, N detection windows are set for each ZC sequence in the ZC sequence group, N is more than or equal to 5, the estimated value of the RTD is determined according to the effective peak value detected in the N detection windows of each ZC sequence, the problem that the RTD of the random access signal cannot be correctly detected in an ultra-high speed scene is solved, the TA value can be correctly adjusted according to the detected RTD by the user equipment moving at the ultra-high speed, the sending time of the message is correctly adjusted, the user equipment can normally access the network in the ultra-high speed scene, and the network access performance is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a flow chart of a method for ultra-high speed random access processing according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for ultra-high speed random access processing according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating the variation of an effective peak in a detection window with frequency offset according to an embodiment of the present invention;
FIG. 4 is a flow chart of another method for ultra-high speed random access processing according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for ultra-high speed random access processing according to another embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a position relationship of an effective peak overlapping a detection window according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an ultra-high speed random access processing apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a method for super-high speed random access processing according to an embodiment of the present invention is described as follows.
101. Selecting a ZC sequence group according to the type of a cell and a first cyclic shift (cyclic shift) parameter Ncs, and setting N detection windows for each ZC sequence in the ZC sequence group, wherein N is more than or equal to 5.
The cell types include an unrestricted cell and a restricted cell, and may be configured according to an application scenario. For example, for a low speed scenario, the cell type may be configured as an unrestricted cell; for high speed scenarios, the cell type may be configured as a restricted cell.
Wherein, the first Ncs is used to represent the size of the cell coverage, i.e. the size of the cell coverage radius; the larger the first Ncs is, the larger the cell coverage is; the configuration of the first Ncs belongs to the prior art and is not described in detail here.
The ZC sequence group comprises M ZC root sequences, M is less than or equal to 64, 838 ZC root sequences are defined in a 3GPP TS 36.211 protocol, and 64 ZC root sequences can be contained in the ZC sequence group at most.
Wherein, setting N detection windows for each ZC sequence in the ZC sequence group may specifically include the following steps:
firstly, du of the ith ZC sequence in the ZC sequence group is obtainedHTThe value is obtained.
Wherein du of the ith ZC sequenceHTThe value refers to when the frequency offset is positive or negativeA shift of a mirror peak of the ith ZC sequence in a power delay profile PDP with respect to the RTD, TSEQIs the time length occupied by the ZC sequence, and the value of i is [1, M]All of the integers of (1).
Wherein, the duHTThe values can be obtained in two ways, namely A1 and A2:
the method A1 is obtained by calculation of a formula I, and specifically includes the following steps:
(formula one)
Wherein p is (p.u) mod NzcU is the physical root number of the ZC sequence, Nzc is the length of the ZC sequence, and the Nzc may be 839 or 139. When Nzc is a fixed value, p is determined by u, then du is obtained according to the above formulaHTIs determined by the value of u.
For example, in the case where Nzc is 839, the physical root number is changedWhen u is 3, (p.3) mod839 is 1, then p is 280, du is obtained according to the formula oneHT-280; when the physical root number u is 836, (P836) mod839 is 1, P1119, du is obtained according to the formulaHT＝280。
Mode a2, obtained by looking up table 2 or table 3.
The time du when Nzc 839 is given in Table 2HTThe value of (u), u ═ 1, …, 419; du for u-420, …, 838HTThe value of (u) may use the formula duHT(Nzc-u)＝-duHT(u), u is 1, …, 419. For example, when the physical root number u is 3, the table lookup yields duHT-280; when u is 450, Nzc-u 839-HT(Nzc-u′)＝-duHT(u′)＝-duHT(389)＝110。
TABLE 2NZCDu 839 thHTValue of
u duHT u duHT u duHT u duHT u duHT u duHT u duHT
1 -1 61 55 121 104 181 394 241 -94 301 -354 361 251
2 419 62 -203 122 -392 182 189 242 52 302 25 362 197
3 -280 63 -293 123 -191 183 298 243 328 303 -36 363 -245
4 -210 64 -118 124 318 184 -114 244 -196 304 -69 364 -325
5 -168 65 -142 125 396 185 -322 245 -363 305 11 365 331
6 -140 66 -89 126 273 186 212 246 324 306 -85 366 149
7 -120 67 288 127 218 187 166 247 -214 307 399 367 16
8 -105 68 37 128 -59 188 299 248 159 308 -79 368 -57
9 -373 69 -304 129 13 189 182 249 -155 309 -410 369 216
10 -84 70 -12 130 -71 190 393 250 198 310 295 370 -161
11 305 71 -130 131 -269 191 -123 251 361 311 116 371 346
12 -70 72 268 132 375 192 -319 252 -283 312 320 372 106
13 129 73 -23 133 82 193 -313 253 -388 313 -193 373 -9
14 -60 74 34 134 144 194 333 254 109 314 -334 374 83
15 -56 75 -179 135 87 195 -327 255 -102 315 277 375 132
16 367 76 -276 136 -401 196 -244 256 390 316 -77 376 -270
17 148 77 -316 137 -49 197 362 257 -111 317 397 377 -227
18 233 78 -398 138 -152 198 250 258 -413 318 124 378 91
19 -265 79 -308 139 169 199 -156 259 -230 319 -192 379 -290
20 -42 80 409 140 -6 200 -172 260 384 320 312 380 -223
21 -40 81 145 141 119 201 96 261 45 321 115 381 -207
22 -267 82 133 142 -65 202 -54 262 285 322 -185 382 358
23 -73 83 374 143 88 203 -62 263 386 323 -213 383 46
24 -35 84 -10 144 134 204 292 264 -232 324 246 384 260
25 302 85 -306 145 81 205 221 265 -19 325 -364 385 -231
26 -355 86 -400 146 408 206 224 266 41 326 -332 386 263
27 -404 87 135 147 234 207 -381 267 -22 327 -195 387 284
28 -30 88 143 148 17 208 -359 268 72 328 243 388 -253
29 405 89 -66 149 366 209 281 269 -131 329 51 389 -110
30 -28 90 -289 150 330 210 -4 270 -376 330 150 390 256
31 -406 91 378 151 50 211 167 271 226 331 365 391 -103
32 -236 92 -228 152 -138 212 186 272 219 332 -326 392 -122
33 -178 93 -415 153 -170 213 -323 273 126 333 194 393 190
34 74 94 -241 154 -158 214 -247 274 395 334 -314 394 181
35 -24 95 -53 155 -249 215 -160 275 180 335 -278 395 274
36 -303 96 201 156 -199 216 369 276 -76 336 417 396 125
37 68 97 -173 157 171 217 -58 277 315 337 239 397 317
38 287 98 351 158 -154 218 127 278 -335 338 -350 398 -78
39 43 99 -339 159 248 219 272 279 -418 339 -99 399 307
40 -21 100 -344 160 -215 220 225 280 -3 340 343 400 -86
41 266 101 -108 161 -370 221 205 281 209 341 -342 401 -136
42 -20 102 -255 162 -347 222 291 282 -360 342 -341 402 48
43 39 103 -391 163 175 223 -380 283 -252 343 340 403 356
44 286 104 121 164 -353 224 206 284 387 344 -100 404 -27
45 261 105 -8 165 300 225 220 285 262 345 107 405 29
46 383 106 372 166 187 226 271 286 44 346 371 406 -31
47 357 107 345 167 211 227 -377 287 38 347 -162 407 235
48 402 108 -101 168 -5 228 -92 288 67 348 -176 408 146
49 -137 109 254 169 139 229 414 289 -90 349 -238 409 80
50 151 110 -389 170 -153 230 -259 290 -379 350 -338 410 -309
51 329 111 -257 171 157 231 -385 291 222 351 98 411 -296
52 242 112 412 172 -200 232 -264 292 204 352 -174 412 112
53 -95 113 -297 173 -97 233 18 293 -63 353 -164 413 -258
54 -202 114 -184 174 -352 234 147 294 117 354 -301 414 229
55 61 115 321 175 163 235 407 295 310 355 -26 415 -93
56 -15 116 311 176 -348 236 -32 296 -411 356 403 416 240
57 -368 117 294 177 237 237 177 297 -113 357 47 417 336
58 -217 118 -64 178 -33 238 -349 298 183 358 382 418 -279
59 -128 119 141 179 -75 239 337 299 188 359 -208 419 2
60 -14 120 -7 180 275 240 416 300 165 360 -282
The du when Nzc 139 is given in Table 3HTThe value of (u), u ═ 1, …, 69; for u 70, …, 138, duHTThe value of (u) may use the formula duHT(Nzc-u)＝-duHT(u), u is 1, …, 69.
TABLE 3NZCDu 139 thHTValue of
u duHT u duHT u duHT u duHT u duHT u duHT u duHT
1 -1 11 -38 21 -53 31 -9 41 61 51 -30 61 41
2 69 12 -58 22 -19 32 13 42 43 52 8 62 65
3 46 13 32 23 6 33 -59 43 42 53 -21 63 -64
4 -35 14 -10 24 -29 34 -45 44 60 54 18 64 -63
5 -28 15 37 25 50 35 -4 45 -34 55 48 65 62
6 23 16 26 26 16 36 27 46 3 56 67 66 40
7 -20 17 49 27 36 37 15 47 68 57 39 67 56
8 52 18 54 28 -5 38 -11 48 55 58 -12 68 47
9 -31 19 -22 29 -24 39 57 49 17 59 -33 69 2
10 -14 20 -7 30 -51 40 66 50 25 60 44
Then, du according to the ith ZC sequenceHTAnd determining the starting positions of N detection windows of the ith ZC sequence.
The number N of detection windows may be preset in the base station according to the frequency offset range, or may be dynamically configured to the base station on the operation maintenance platform.
For example, when the frequency offset range isIn this case, as an embodiment, the detection windows of the ZC sequence are configured to be 5, but the detection windows of the ZC sequence may also be configured to be more than 5; when the frequency deviation range isWhen W > 5, the number N of detection windows of the ZC sequence may be configured to be W, and the number N of detection windows of the ZC sequence may be configured to be larger than W.
And finally, setting N detection windows of the ith ZC sequence according to the initial positions of the N detection windows of the ith ZC sequence and the preset size of the detection windows.
The window size of the detection window can be preset according to the cell radius, and the window size is not smaller than the RTD corresponding to the cell radius. For example, the detection window may be expanded according to the multipath delay and the like on the basis of the RTD corresponding to the cell radius.
102. And sending the cell type, the second Ncs and the ZC sequence group to User Equipment (UE), so that the UE selects a random access sequence in the ZC sequence group.
And the second Ncs refers to an index value which can ensure that the UE adopts a ZC root sequence in the ZC sequence group as a random access sequence. For example, the following two configurations may be adopted:
in a first mode, when the cell type is configured as an unrestricted cell (or low-speed cell), the second Ncs index is 0;
in the second mode, when the cell type is configured as a restricted cell (or a high speed cell), the second Ncs index is 14.
In the second embodiment, the second Ncs index is not limited to 14, but may be any index that can satisfy the requirement that the UE adopts the ZC sequence without cyclic shift as the random access sequence to reduce the probability of overlapping of N detection windows of the ZC sequence; the second Ncs may be set in the base station, or obtained by judging or looking up a table according to the configured cell type in the base station, and sent to the UE through a system message.
It should be noted that the first Ncs in step 101 is set according to the coverage of the cell, which reflects the size of the coverage radius of the cell; the second Ncs in step 102 is only used to transmit to the UE, so that the UE can reduce the probability of overlapping the N detection windows by using the ZC root sequence in the ZC sequence group as the random access sequence, instead of using the cyclically shifted ZC sequence as the random access sequence. If the index value of the first Ncs in step 101 satisfies the condition that the UE adopts a ZC sequence without cyclic shift as a random access sequence, the first Ncs and the second Ncs may be the same.
Wherein, part of ZC sequences in the ZC sequence group are used for competitive access, and part of ZC sequences are used for non-competitive access; for the competitive access, the UE randomly selects a ZC sequence from the ZC sequences used for the competitive access in the ZC sequence group as a random access sequence; for non-contention access, the base station instructs the UE which ZC sequence from the set of ZC sequences to use as the random access sequence.
103. And receiving a random access signal sent by the UE, and acquiring the random access sequence from the random access signal.
104. And respectively carrying out correlation processing (correlation) on the random access sequence and each ZC sequence in the ZC sequence group, detecting effective peaks in N detection windows of each ZC sequence, and determining an estimated value of the RTD (round trip delay) according to the effective peaks.
The valid peak is obtained by determining the size and position of the maximum peak in each detection window, which is specifically as follows:
when only one of the maximum peak values is larger than the detection threshold, selecting the peak value larger than the detection threshold as an effective peak value, wherein the effective peak value can also be called as a main peak value;
when two or more maximum peak values are larger than the detection threshold, judging whether the absolute positions of the maximum two peak values are overlapped; if not, selecting the two maximum peak values as effective peak values; wherein, the largest effective peak value of the two effective peak values is called a main peak value, and the smallest effective peak value of the two effective peak values is called a secondary peak value; and if the two peak values are overlapped, the two maximum peak values are the same peak value and are used as main peak values, and the maximum peak value which is larger than the detection threshold and is detected in a detection window corresponding to the frequency offset +1 of the detection window where the main peak value is located or the frequency offset-1 RACH subcarrier interval of the detection window is a secondary peak value.
Wherein, the detection threshold can be set according to the false alarm performance requirement under discontinuous transmission.
The estimated value of the RTD is the offset of the effective peak value relative to the initial position of a detection window where the effective peak value is located; if the starting position of the detection window where the effective peak value is located is according to du of the ZC sequenceHTThe value is translated on the basis of the determined initial position, and the estimated value of the RTD can be obtained according to the offset value of the effective peak value relative to the initial position of the detection window where the effective peak value is located, the translation direction, and the translated sampling point, which are specifically as follows:
assuming that the initial position of the detection window where the effective peak value is located is shifted to the left by a preset sampling point, the estimated value of the RTD is obtained by subtracting the preset sampling point number from the offset value of the effective peak value relative to the initial position of the detection window where the effective peak value is located; assuming that the initial position of the detection window where the effective peak value is located is shifted to the right by a preset sampling point, the estimated value of the RTD is the offset value of the effective peak value relative to the initial position of the detection window where the effective peak value is located plus the preset number of samples.
By adopting the ultra-high speed random access processing method provided by the embodiment, the problem that the RTD of the random access signal can not be correctly detected in an ultra-high speed scene can be solved, and the TA value can be correctly adjusted by the ultra-high speed mobile user equipment according to the detected RTD, so that the sending time of the message can be correctly adjusted, the user equipment can normally access the network in the ultra-high speed scene, and the network access performance is improved.
As shown in fig. 2, in the ultra high speed random access processing method provided in the embodiment of the present invention, when the frequency offset range of the ultra high speed random access is within the range ofThen, N ═ 5 detection windows are set for each ZC sequence in the ZC sequence group, as described below.
201. And selecting a ZC sequence group according to the cell type and the first Ncs.
Wherein, the cell type and the first Ncs, and the related description of the ZC sequence group are referred to step 101.
The specific description of selecting the ZC sequence group according to the cell type and the first Ncs is as follows:
b1, selecting a ZC sequence group according to the cell type and the first Ncs;
b2, judging du of each ZC sequence in the ZC sequence groupHTWhether or not the values all satisfy the condition | du HT | ∈ [ Ncs , Nzc - Ncs 4 ] ∪ [ Nzc + Ncs 4 , Nzc - Ncs 3 ] ∪ [ Nzc + Ncs 3 , Nzc - Ncs 2 ] , Nzc is the length of each ZC sequence; ncs refers to the first Ncs;
if there is du of at least one ZC sequence in the ZC sequence groupHTValue of not fullIf the condition is satisfied, returning to the step B1;
if du of the ZC sequences in the ZC sequence groupHTAnd when the values all meet the condition, sending the ZC sequence group to user equipment.
Wherein, the duHTThe manner of obtaining the value can be referred to in the related description of step 101.
It is noted that du of each ZC sequence in the selected ZC sequence groupHTAll values satisfy the condition | du HT | ∈ [ Ncs , Nzc - Ncs 4 ] ∪ [ Nzc + Ncs 4 , Nzc - Ncs 3 ] ∪ [ Nzc + Ncs 3 , Nzc - Ncs 2 ] According to du of each ZC sequenceHTThe 5 detection windows set by the value can not be overlapped, and the accuracy of RTD estimation is improved.
For example, assuming that the cell type is a restricted cell, the first Ncs set according to the cell radius is 15, the selected ZC sequence group includes 64 ZC sequences, and the length Nzc of the ZC sequence is 839, then the method of selecting the ZC sequence group according to the cell type and the first Ncs is exemplified as follows:
first, according to the cell type and the first Ncs, the logical root sequence numbers of 64 ZC sequences are selected.
Table 4 is a table of correspondence between restricted cell Ncs and logical root sequence numbers, where the Ncs value in the first column is 15, where the first logical root sequence number corresponding to the first Ncs value of 15 is 24, and the first logical root sequence number corresponding to the second Ncs value of 15 is 819, so that when the first Ncs value is 15, the available logical root sequence numbers are [24, 819 ].
Table 4 correspondence table between restricted cell Ncs and logical root sequence number
NCSValue (restricted cell) Logical root sequence number
- 0-23
15 24-29
18 30-35
22 36-41
26 42-51
32 52-63
38 64-75
46 76-89
55 90-115
68 116-135
82 136-167
100 168-203
128 204-263
158 264-327
202 328-383
237 384-455
237 456-513
202 514-561
158 562-629
128 630-659
100 660-707
82 708-729
68 730-751
55 752-765
46 766-777
38 778-789
32 790-795
26 796-803
22 804-809
18 810-815
15 816-819
- 820-837
And secondly, acquiring the physical root serial numbers of the 64 ZC sequences according to the corresponding relation table of the logical root serial numbers and the physical root serial numbers.
Table 5 shows the correspondence between the partial logical root sequence numbers and the physical root sequence numbers.
TABLE 5 correspondence table of logical root number and physical root number
If the selected logical root sequence number is 384, the physical root sequence numbers of 64 ZC sequences can be obtained according to the corresponding relationship between the logical root sequence number and the physical root sequence number in Table 5: 3,836, 19, 820, 22, 817, 41, 798, 38, 801, 44, 795, 52, 787, 45, 794, 63, 776, 67, 772, 72, 767, 76, 763, 94, 745, 102, 737, 90, 749, 109, 730, 165, 674, 111, 728, 209, 630, 204, 635, 117, 722, 188, 651, 159, 680, 198, 641, 113, 726, 183, 656, 180, 659, 177, 662, 196, 643, 155, 684, 214, 625, 126, 713.
Then, du of the 64 ZC sequences is obtainedHTThe value is obtained.
According to du in step 101HTThe related description and the obtaining method of (1) can obtain: when the physical root number u is 3, duHT-280; when the physical root number u is 836, duHT280; when the physical root number u is 19, duHT＝265；...。
Finally, du of the 64 selected ZC sequences is judgedHTWhether or not all values satisfy | du HT | ∈ [ Ncs , Nzc - Ncs 4 ] ∪ [ Nzc + Ncs 4 , Nzc - Ncs 3 ] ∪ [ Nzc + Ncs 3 , Nzc - Ncs 2 ] If the condition is not satisfied, reselecting the ZC sequence group.
Obtaining | du through calculation according to the first Ncs and NzcHT|∈[15，206]∪[213，274]∪[284，412]And, in the above-mentioned 64 selected ZC sequences, du with physical root number 3, 836HTThe values are all not satisfied with duHTThe value condition, therefore, 64 ZC sequences are re-selected according to the above-mentioned ZC sequence group selection procedure.
Suppose the physical root sequence numbers of the reselected 64 ZC sequences are: 56, 783, 112, 727, 148, 691, 80, 759, 42, 797, 40, 799, 35, 804, 73, 766, 146, 693, 31, 808, 28, 811, 30, 809, 29, 810, 27, 812, 24, 815, 48, 791, 68, 771, 74, 765, 178, 661, 136, 703, 86, 753, 78, 761, 43, 796, 39, 800, 20, 819, 21, 818, 95, 744, 202, 637, 190, 649, 181, 658, 137, 702, 125, 714 to obtain duHTValue, du confirming said re-selected 64 ZC sequencesHTThe value satisfies du aboveHTThe conditions of (1).
202. And setting N-5 detection windows for each ZC sequence in the ZC sequence group.
When the ZC sequence group includes M ZC sequences, setting N — 5 detection windows for each ZC sequence in the ZC sequence group is specifically as follows:
c1, obtaining du of ith ZC sequence in the ZC sequence groupHTA value;
wherein du of the ith ZC sequenceHTThe value refers to when the frequency offset is positive or negativeA shift of a mirror peak of the ith ZC sequence in a power delay profile PDP with respect to the RTD, TSEQIs the time length occupied by the ZC sequence, and the value of i is [1, M]All of the integers of (1).
C2 du according to the ith ZC sequenceHTAnd setting 5 detection windows of the ith ZC sequence.
First, du is determined according to the ith ZC sequenceHTAnd obtaining the starting positions of 5 detection windows of the ith ZC sequence.
Wherein, 5 detection windows of the ith ZC sequence are a detection window ①, a detection window ②, a detection window ③, a detection window ④ and a detection window ⑤ respectively, and the 5 detection windows ①②③④⑤ correspond to frequency offset 0/-delta f respectivelyRA/+ΔfRA/-2ΔfRA/+2ΔfRAThe method comprises the following steps:
the initial position of a detection window I is 0;
the start position of the detection window ② is mod (du)HT，Nzc)；
The start position of detection window ③ is mod (-du)HT，Nzc)；
The start position of the detection window ④ is mod (2 × du)HT，Nzc)；
The start position of the detection window ⑤ is mod (-2 × du)HT，Nzc)。
Wherein mod (du)HTOf Nzc)Means duHTmod Nzc, Nzc being the length of the ith ZC sequence, duHTThe manner in which the values are obtained can be seen in step 101.
Then, setting 5 detection windows of the ith ZC sequence according to the starting positions of the 5 detection windows of the ith ZC sequence and the preset size of the detection window.
Wherein the window size of the detection window is consistent with the relevant description in step 101; the starting position of the detection window can be translated according to the preset sampling point so as to adapt to the condition that the UE sends the random access signal in advance or in a delayed mode.
203. And transmitting the cell type, the second Ncs and the ZC sequence group to the UE, so that the UE selects a random access sequence in the ZC sequence group.
The second Ncs is described in step 102.
204. And receiving a random access signal sent by the UE, and acquiring the random access sequence from the random access signal.
205. And respectively carrying out correlation processing on the random access sequence and each ZC sequence in the ZC sequence group, detecting effective peaks in 5 detection windows of each ZC sequence, and determining an estimated value of the RTD according to the effective peaks.
Wherein the effective peak, estimated value of RTD is consistent with the correlation description in step 104.
Wherein, the determining the round trip transmission delay according to the effective peak value can be obtained by adopting the following two methods:
method (1): directly obtaining an estimated value of the RTD according to the deviation of the main peak value relative to the initial position of the main peak value detection window;
method (2): and selecting data of at least two detection windows according to a preset principle, merging the data, obtaining an effective peak value again, and performing RTD estimation.
In the method (2), the preset principle may be to combine the detection windows on both sides of the main peak, or combine the detection window where the main peak is located and the detection window where the secondary peak is located, or combine all the detection windows. Since the detection windows are combined, the detection threshold of the effective peak is increased accordingly, so that the effective peak can be obtained again, and the RTD can be estimated according to the obtained effective peak.
206. And carrying out frequency offset estimation according to the detection window where the effective peak value is located.
The estimated value of the frequency offset is used for correcting the uplink signal of the UE and demodulating a Message3 Message sent by the UE, wherein the Message3 carries an identifier of the UE.
Fig. 3 is a schematic diagram of an effective peak in a detection window changing with frequency offset, wherein the frequency offset estimation is performed according to the detection window where the effective peak is located, and the following three conditions are specifically distinguished:
case 1, when there are two valid peaks, if the main peak is located in the detection window ① and the sub-peak is located in the detection window ③, the frequency offset of the UE uplink signal can be estimated to be 0 to 0 according to the schematic diagram of the variation of the peak with the frequency offset in each window shown in fig. 3A value within the range, if the maximum peak value is located in the detection window ③ and the second maximum peak value is located in the detection window ⑤, then the frequency offset of the UE uplink signal is estimated to be Δ fRAToA value within the range; and so on.
Case 2. if there are two valid peaks, one within the detection window ① and the other within the detection window ③, the frequency offset of the UE uplink signal is estimated to be aboutIf there are two valid peaks, one within the detection window ③ and the other within the detection window ⑤, then the frequency offset of the UE uplink signal is estimated to be aboutAnd so on.
Case 3, if there is a valid peak and the peak is located within the detection window ①, the frequency offset of the UE uplink signal is estimated to be 0, and if there is a valid peak and the peak is located within the detection window ②, the frequency offset of the UE uplink signal is estimated to be- Δ fRAIf there is a valid peak and the peak is located in the detection window ④, then the frequency offset of the UE uplink signal is estimated to be-2 deltafRA(ii) a And so on.
It should be noted that the step 205 is optional, i.e. not performing frequency offset estimation, but rather demodulating the Message3 according to the frequency offset range. For example, the frequency offset range is [ -3KHz, 3KHz ], and demodulation can be performed in 6 steps with 1KHz as the first step.
The ultra-high speed random access processing method provided in the above embodiment selects the ZC sequence group according to the cell type and the first Ncs, and ensures du of the ZC sequence in the ZC sequence groupHTValue satisfies the condition | du HT | ∈ [ Ncs , Nzc - Ncs 4 ] ∪ [ Nzc + Ncs 4 , Nzc - Ncs 3 ] ∪ [ Nzc + Ncs 3 , Nzc - Ncs 2 ] , And according to du of each ZC sequence in the ZC sequence groupHTSetting N-5 non-overlapping detection windows for each ZC sequence in the ZC sequence group, detecting effective peak values in the non-overlapping detection windows, and determining round-trip transmission delay, which not only can solve the problem that the frequency offset range isThe method can also improve the accuracy of the RTD estimated value.
As shown in fig. 4, in the ultra high speed random access processing method provided in the embodiment of the present invention, when the frequency offset range of the ultra high speed random access is within the range ofThen, N ═ 5 detection windows are set for each ZC sequence in the ZC sequence group, as described below.
401. And selecting a ZC sequence group according to the cell type and the first Ncs.
Wherein the cell type is a restricted cell; the first Ncs represents the coverage of the restricted cell.
The selection of the ZC sequence group may be obtained according to a selection principle of a root sequence of a restricted cell in the prior art, and details are not described here.
402. And setting N-5 detection windows for each ZC sequence in the ZC sequence group.
Wherein, the step 202 may be referred to for the description of setting N detection windows for each ZC sequence in the ZC sequence group.
403. And transmitting the cell type, the second Ncs and the ZC sequence group to the UE, so that the UE selects a random access sequence in the ZC sequence group.
The second Ncs is described in step 102.
404. And receiving a random access signal sent by the UE, and acquiring the random access sequence from the random access signal.
405. And respectively carrying out correlation processing on the random access sequence and each ZC sequence in the ZC sequence group, detecting a main peak value in 5 detection windows of each ZC sequence, and determining a secondary peak value detection window according to the main peak value.
Searching a maximum peak value in 5 detection windows of each ZC sequence respectively, and judging whether the absolute positions of two maximum peak values in the 5 maximum peak values are overlapped; if not, selecting a maximum peak value from the maximum two peak values as a main peak value; and if the two peak values are overlapped, selecting the window where the two maximum peak values are positioned as the window where the main peak value is positioned. For example, when a main peak occurs at the overlap of two detection windows, the main peak is detected in the two detection windows respectively, that is, the same peak is detected twice, and thus, it is possible to confirm whether the two maximum peaks overlap by determining whether the absolute positions of the two maximum peaks overlap.
TABLE 6 search window of degree peaks
Window with main peak Search window of sub-peak
① ②③
② ①④
③ ①⑤
④ ②
⑤ ③
②⑤ ①③
③④ ①②
④⑤ ②③
For example, assuming that the main peak appears in the overlapping portion of the detection window (c), the search windows for the sub-peaks are window (c) and window (c) with reference to table 6.
406. And detecting a secondary peak value in the secondary peak value search window, and determining a window combination of frequency offset estimation and an RTD estimation window according to a combination of a detection window where the primary peak value is located and a detection window where the secondary peak value is located.
And detecting the secondary peak values in the search windows of the secondary peak values, namely finding a maximum peak value in the search windows of the secondary peak values respectively, comparing the maximum peak values, and selecting the maximum peak value as the secondary peak value, wherein the maximum peak value is larger than the detection threshold.
And determining a window combination of frequency offset estimation and an RTD estimation window through a lookup table 7 according to the window where the secondary peak value is located and the window where the main peak value is located.
For example, assuming that the main peak appears in the overlapping portion of the detection window (c), it can be seen from table 7 that the sub peak is searched in the detection window (c) and the detection window (c). When the secondary peak is searched in the detection window, combining the detection windows after the two peak searches to be (iv), selecting the detection window (iv) to carry out RTD estimation and selecting the detection window (iv) to carry out frequency offset estimation according to the table 7; when the secondary peak is searched in the detection window (c), the detection windows after the two peak searches are combined to (c), according to table 7, the detection window (c) is selected for RTD estimation, and the detection window (c) is selected for frequency offset estimation.
TABLE 7 Window combination of frequency offset estimation and RTD estimation window
It should be noted that if the window combination of frequency offset estimation displays fail, no user is detected in the detection window of the ZC sequence; otherwise, the RTD estimation is carried out according to the appointed RTD estimation window.
407. And determining the estimated value of the RTD according to the position of the effective peak value in the RTD estimation window.
Wherein the estimated value of the RTD is the offset of a valid peak in the RTD estimation window relative to the starting position of the RTD estimation window; if the starting position of the RTD estimation window is obtained by translating preset sampling points, the RTD estimation value is the offset value of the effective peak value in the RTD estimation window relative to the starting position of the RTD estimation window plus or minus the preset number of sampling points, which is specifically as follows:
assuming that the initial position of the RTD estimation window moves to the left by a preset sampling point, the RTD estimation value is obtained by subtracting the preset sampling point number from the offset value of the initial position of the RTD estimation window; and if the starting position of the RTD estimation window is moved to the right by a preset sampling point, the RTD estimation value is the offset value of the starting position of the RTD estimation window plus the preset number of sampling points.
408. And determining the estimated value of the frequency offset according to the window combination of the frequency offset estimation.
How to determine the estimated value of the frequency offset according to the window combination of the frequency offset estimation can be referred to the related description in step 206.
The estimated value of the frequency offset is used for rectifying the uplink signal of the UE, so as to demodulate the Message 3.
It should be noted that step 408 is optional, i.e. the Message3 may be demodulated in stages according to the frequency offset range without performing frequency offset estimation. For example, the frequency offset range is [ -3KHz, 3KHz ], and demodulation can be performed in 6 steps with 1KHz as the first step.
The method for performing super-high speed random access processing provided in the above embodiment selects a ZC sequence group by using a rule of selecting ZC sequences from a restricted cell in the prior art, sets 5 detection windows for each ZC sequence in the ZC sequence group, detects an effective peak in the 5 detection windows of each ZC sequence, and determines an RTD estimation window according to a combination of a detection window in which a main peak is located and a detection window in which a sub peak is located in the effective peak, thereby determining an estimated value of an RTD, solving a problem of detection of an RTD when the effective peak is located at an overlapping position of the detection windows, and realizing that a frequency offset range is within a frequency offset rangeThe random access signal processing under the ultra-high speed mobile scene in the network improves the network access performance.
As shown in fig. 5In the method for processing ultra-high speed random access provided by the embodiment of the present invention, when the frequency offset range of the ultra-high speed random access is within the range ofWhen W is larger than or equal to 5, N (N is larger than or equal to W) detection windows are respectively set for each ZC sequence in the ZC sequence group, which is specifically described as follows.
501. And selecting a ZC sequence group according to the cell type and the first Ncs.
The selection of the ZC sequence group is obtained according to a configuration principle of a root sequence of a restricted cell, and belongs to the prior art, and details are not described here.
The cell type and the first Ncs are described in step 101.
502. And setting N detection windows for each ZC sequence in the ZC sequence group.
When the ZC sequence group includes M ZC sequences, the setting of N detection windows for each ZC sequence in the ZC sequence group is specifically as follows:
d1, obtaining du of ith ZC sequence in the ZC sequence groupHTThe value is obtained.
Wherein, the duHTFor the relevant description of the values, and the acquisition method, see step 101; i is [1, M ]]All of the integers of (1).
D2 du according to the ith ZC sequenceHTAnd determining the starting positions of N detection windows of the ith ZC sequence.
Wherein N detection windows ①②③④⑤⑥⑦ of the ith ZC sequence correspond to frequency offsets 0/- Δ f, respectivelyRA/+ΔfRA/-2ΔfRA/+2ΔfRA/-3ΔfRA/+3ΔfRAI.. The starting positions are as follows:
the initial position of a detection window I is 0;
detection window ②Has a starting position of mod (du)HT，Nzc)；
The start position of detection window ③ is mod (-du)HT，Nzc)；
The start position of the detection window ④ is mod (2 × du)HT，Nzc)；
The start position of the detection window ⑤ is mod (-2 × du)HT，Nzc)；
The start position of the detection window ⑥ is mod (3 × du)HT，Nzc)；
The start position of the detection window ⑦ is mod (-3 × du)HT，Nzc)；
Others may be analogized.
Wherein mod (du)HTWith the meaning of du Nzc)HTmod Nzc, Nzc being the length of the ith ZC sequence.
D3, setting N detection windows of the ith ZC sequence according to the starting positions of the N detection windows of the ith ZC sequence and the preset size of the detection window.
The size of the detection window can be configured according to the radius of the cell, and the detection window is not smaller than the RTD corresponding to the radius of the cell.
503. And transmitting the cell type, the second Ncs and the ZC sequence group to the UE, so that the UE selects a random access sequence in the ZC sequence group.
The second Ncs is described in step 102.
504. And receiving a random access signal sent by the UE, and acquiring the random access sequence from the random access signal.
505. And respectively carrying out correlation processing on the random access sequence and each ZC sequence in the ZC sequence group, detecting effective peaks in N detection windows of each ZC sequence, and determining an estimated value of the RTD according to the effective peaks.
Wherein the correlation description of the effective peak can be seen in step 104.
Wherein the determining the estimated value of the RTD according to the effective peak may include steps E1 and E2, which are specifically described as follows:
e1, determining an RTD estimation window according to the detection window where the effective peak value is located.
If the detection window of the ZC sequence where the effective peak value is located is not overlapped with other detection windows of the ZC sequence, one of the detection windows where the effective peak value is located is selected as an RTD estimation window; or,
if the detection window of the ZC sequence where the effective peak value is located is overlapped with other detection windows of the ZC sequence, but at least one effective peak value appears in a non-overlapped part, the detection window where the at least one effective peak value is located is used as an RTD estimation window; or,
and if the detection window of the ZC sequence where the effective peak value is located is overlapped with other detection windows of the ZC sequence, and the effective peak values are all present in the overlapped part, carrying out frequency offset processing on the random access signal according to the frequency offsets of two detection windows where the main peak value is located in the effective peak values to obtain a new effective peak value, and determining the frequency offset and the RTD estimation window according to the new effective peak value.
Wherein the other detection windows of the ZC sequence refer to detection windows other than the detection window in which the valid peak is located, among the N detection windows of the ZC sequence.
For example, assuming that N ═ 6 detection windows are set for each ZC sequence in steps 503 and 504, that is, each ZC sequence has detection windows (c), if valid peaks are detected in the detection window (c) of the first ZC sequence, it is determined whether the detection window (c) of the first ZC sequence overlaps with other detection windows of the first ZC sequence, that is, the detection window (c) of the first ZC sequence.
The detection windows are overlapped, but at least one effective peak value appears in a non-overlapped part, namely that although the detection windows are overlapped, at least one effective peak value exists in the detected effective peak values in the non-overlapped part of the detection windows, and at this time, the detection window where the effective peak value appearing in the non-overlapped part of the detection windows is located is selected for RTD estimation. As shown in fig. 6, 5 detection windows are taken as an example, and are illustrated as follows:
as shown in fig. 6(a), when the secondary peak appears in the detection window (r), the RTD estimation can be performed using the detection window (r).
As shown in FIG. 6(b), the primary peaks occur at the overlap of detection windows ②⑤, and the received signal is frequency-shifted by +1/-2 Δ f, respectively, without secondary peaksRAAnd then, obtaining a new effective peak value, and determining the frequency offset according to the new effective peak value so as to determine an RTD estimation window.
As shown in FIG. 6(c), the major peaks occur at the overlap of the detection windows ③④, and the minor peaks at the overlap of the detection windows ②⑤, respectively, shift the received signal by-1.5/+ 1.5 Δ fRAAnd then, obtaining a new effective peak value, and determining the frequency offset according to the new effective peak value so as to determine an RTD estimation window.
As an implementation manner, if a detection window of the ZC sequence where the valid peak is located overlaps with other detection windows of the ZC sequence, and the valid peak occurs in an overlapping portion, it is determined that a random access signal is not detected in the detection window where the valid peak is located, the random access initiated by the UE fails, and the access is re-initiated.
E2, determining the estimated value of the RTD according to the position of the effective peak value in the RTD estimation window.
The implementation method of step C2 may specifically refer to the relevant description in step 407.
It should be noted that the ultra-high speed random access processing method provided in this embodimentFor a frequency deviation range ofW is more than or equal to 5; and when W is larger than 5, respectively setting N detection windows for the ZC sequences in the selected ZC sequence group, wherein N is not smaller than W.
In the above embodiment, a ZC sequence group is selected by using a ZC sequence selection principle in a restricted cell in the prior art, N detection windows are respectively set for each ZC sequence in the ZC sequence group, an effective peak is detected in the N detection windows of each ZC sequence, and a RTD estimation window is determined according to a detection window in which the effective peak is located, so as to determine a round trip transmission delay and solve a problem that a frequency offset range is within a frequency offset rangeThe RTD is difficult to detect correctly under the ultra-high speed scene with W being more than or equal to 5, and the network access performance is improved.
As shown in fig. 7, an apparatus for super high speed random access processing according to an embodiment of the present invention, which may be a base station, includes: the device comprises a selecting unit 701, a setting unit 702, a sending unit 703, a receiving unit 704 and a detecting unit 705.
A selecting unit 701, configured to select a ZC sequence group according to a cell type and a first Ncs;
a setting unit 702, configured to set N detection windows for each ZC sequence in the ZC sequence group, where N is greater than or equal to 5;
a sending unit 703, configured to send the cell type, the second Ncs, and the ZC sequence group selected by the selecting unit 701 to a user equipment UE, so that the UE selects a random access sequence in the ZC sequence group;
a receiving unit 704, configured to receive a random access signal sent by the UE, and acquire the random access sequence from the random access signal;
a detecting unit 705, configured to perform correlation processing on the random access sequence acquired by the receiving unit 704 and each ZC sequence in the ZC sequence group, detect an effective peak in N detection windows set for each ZC sequence by the setting unit 702, and determine an estimated value of a round trip delay RTD according to the effective peak.
Optionally, corresponding to the method embodiment shown in fig. 1, when the ZC sequence group selected by the selecting unit 701 includes M ZC sequences, the setting unit 702 is further configured to:
obtaining du of ith ZC sequence in the ZC sequence groupHTA value;
du according to the ith ZC sequenceHTDetermining the starting positions of N detection windows of the ith ZC sequence;
and setting N detection windows of the ith ZC sequence according to the initial positions of the N detection windows of the ith ZC sequence and the preset size of the detection window.
Wherein du of the ith ZC sequenceHTThe value is when the frequency offset is positive or negativeThe shift of the mirror image peak in the power delay spectrum PDP of the ith ZC sequence relative to the round-trip transmission delay RTD, TSEQIs the time length occupied by the ith ZC sequence, and the value of i is [1, M]All of the integers of (1); duHTThe value acquisition method is described in step 101.
The size of the detection window can be configured according to the radius of the cell, and the detection window cannot be smaller than the maximum value of the RTD.
Optionally, when the frequency offset range of the ultra-high speed random access isAnd when the ZC sequence group selected by the selecting unit 701 includes M ZC sequences, N — 5 detection windows are respectively set for each ZC sequence in the ZC sequence group, that is, the method shown in fig. 2 is used to implement the methodIn an embodiment, the setting unit 702 is further configured to:
obtaining du of ith ZC sequence in the ZC sequence groupHTA value;
du according to the ith ZC sequenceHTAnd setting 5 detection windows of the ith ZC sequence.
Wherein du of the ith ZC sequenceHTThe value refers to when the frequency offset is positive or negativeA shift of a mirror peak of the ith ZC sequence in a power delay profile PDP with respect to the RTD, TSEQIs the time length occupied by the ZC sequence, and the value of i is [1, M]All of the integers of (1); duHTThe value acquisition method is described in step 101.
Optionally, when the frequency offset range of the ultra-high speed random access isIn this case, N — 5 detection windows are respectively set for each ZC sequence in the ZC sequence group, that is, corresponding to the embodiment of the method shown in fig. 2, the setting unit 702 is further configured to:
according to du of ith ZC sequence in the ZC sequence groupHTObtaining the starting positions of 5 detection windows of the ith ZC sequence;
wherein the initial position of the detection window I is 0;
the start position of the detection window ② is mod (du)HT，Nzc)；
The start position of detection window ③ is mod (-du)HT，Nzc)；
The start position of the detection window ④ is mod (2 × du)HT，Nzc)；
The start position of the detection window ⑤ is mod (-2 × du)HT，Nzc)；
And setting 5 detection windows of the ith ZC sequence according to the initial positions of the 5 detection windows of the ith ZC sequence and the preset size of the detection window.
Wherein Nzc is the length of the ith ZC sequence, du isHTThe value obtaining method refers to the related description in step 101, the related description of the preset detection window size refers to step 104, and the 5 detection windows ①②③④⑤ correspond to the frequency offset 0/- Δ f respectivelyRA/+ΔfRA/-2ΔfRA/+2ΔfRA。
Optionally, when the frequency offset range of the ultra-high speed random access isIn time, corresponding to the embodiment of the method shown in fig. 2, the selecting unit 701 is further configured to:
judging du of the ZC sequences in the selected ZC sequence groupHTWhether the value satisfies the condition | du HT | ∈ [ Ncs , Nzc - Ncs 4 ] ∪ [ Nzc + Ncs 4 , Nzc - Ncs 3 ] ∪ [ Nzc + Ncs 3 , Nzc - Ncs 2 ] , Ncs in the conditions is the first Ncs, Nzc is the length of the ZC sequence;
if there is du of at least one ZC sequence in the selected ZC sequence groupHTIf the value does not meet the condition, reselecting a ZC sequence group according to the cell type and the first Ncs;
if du of the ZC sequences in the selected ZC sequence groupHTIf the values both satisfy the condition, the selected ZC sequence group is sent to the setting unit 702 and the sending unit 703.
Optionally, corresponding to the method embodiment shown in fig. 4, the detecting unit 704 is further configured to:
detecting a main peak value in the effective peak values in 5 detection windows of each ZC sequence in the ZC sequence group;
determining a search window of a secondary peak value in the effective peak values according to the detection window where the primary peak value is located;
detecting a secondary peak value in a search window of the secondary peak value, and determining an RTD estimation window according to a combination relation of a detection window where the primary peak value is located and a detection window where the secondary peak value is located;
and determining the estimated value of the RTD according to the position of the effective peak value in the RTD estimation window.
Optionally, corresponding to the method embodiment shown in fig. 5, the setting unit 702 is further configured to:
according to du of ith ZC sequence in the ZC sequence groupHTDetermining the starting positions of N detection windows of the ith ZC sequence, as follows:
the initial position of a detection window I is 0;
the start position of the detection window ② is mod (du)HT，Nzc)；
The start position of detection window ③ is mod (-du)HT，Nzc)；
The start position of the detection window ④ is mod (2 × du)HT，Nzc)；
The start position of the detection window ⑤ is mod (-2 × du)HT，Nzc)；
The start position of the detection window ⑥ is mod (3 × du)HT，Nzc)；
The start position of the detection window ⑦ is mod (-3 × du)HT，Nzc)；
The rest is analogized in the same way;
wherein mod (du)HTWith the meaning of du Nzc)HTmod Nzc, Nzc being the length of the ith ZC sequence;
and setting N detection windows of the ith ZC sequence according to the initial positions of the N detection windows of the ith ZC sequence and the preset size of the detection window.
Wherein the N detection windows ①②③④⑤ of the ZC sequence correspond to frequency offsets 0/- Δ f, respectivelyRA/+ΔfRA/-2ΔfRA/+2ΔfRA/-3ΔfRA/+3ΔfRA/...。
The detection unit 704 is further configured to:
determining an RTD estimation window according to the detection window where the effective peak value is located;
if the detection window of the ZC sequence where the effective peak value is located is not overlapped with other detection windows of the ZC sequence, one of the detection windows where the effective peak value is located is selected as an RTD estimation window; or,
if the detection window of the ZC sequence where the effective peak value is located is overlapped with other detection windows of the ZC sequence, but at least one effective peak value appears in a non-overlapped part, determining the detection window where the at least one effective peak value is located as an RTD estimation window; or,
if the detection window of the ZC sequence where the effective peak value is located is overlapped with other detection windows of the ZC sequence and the effective peak value appears in the overlapped part, determining that a random access signal is not detected in the detection window where the effective peak value is located, or performing frequency offset processing on the random access signal according to the frequency offsets of two detection windows where main peak values are located in the effective peak values to obtain a new effective peak value, and determining a frequency offset and an RTD estimation window according to the new effective peak value;
and determining the estimated value of the RTD according to the position of the effective peak value in the RTD estimation window.
Wherein the relevant description of the other detection windows of the ZC sequence is consistent with step 507.
Optionally, the detecting unit 704 is further configured to:
and carrying out frequency offset estimation according to the detection window where the effective peak value is located.
Wherein, the frequency offset estimation is performed according to the detection window where the effective peak value is located, see step 206.
It is noted that the selecting unit 701, the setting unit 702, the transmitting unit 703, the receiving unit 704, and the detecting unit 705 may be all CPUs, digital signal processors, or other processors.
The ultra-high-speed random access processing device provided by the embodiment solves the problem that the RTD of the random access signal cannot be correctly detected in an ultra-high-speed scene, and ensures that the user equipment moving at an ultra-high speed can correctly adjust the TA value according to the detected RTD, so that the sending time of the message is correctly adjusted, the user equipment can normally access the network in the ultra-high-speed scene, and the network access performance is improved.
The system includes the ultra-high speed random access processing apparatus shown in fig. 7.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (17)

1. A method of ultra-high speed random access processing, the method comprising:
selecting Zadoff-Chu, namely a ZC sequence group, according to the type of the cell and a first cyclic shift parameter Ncs, and setting N detection windows for each ZC sequence in the ZC sequence group, wherein N is more than or equal to 5;
sending the cell type, the second Ncs and the ZC sequence group to User Equipment (UE), so that the UE selects a random access sequence in the ZC sequence group;
receiving a random access signal sent by the UE, and acquiring the random access sequence from the random access signal;
and respectively carrying out correlation processing on the random access sequence and each ZC sequence in the ZC sequence group, detecting effective peaks in N detection windows of each ZC sequence, and determining an estimated value of the RTD (round trip delay) according to the effective peaks.
2. The method of claim 1, wherein when the set of ZC sequences contains M ZC sequences, the setting N detection windows for each ZC sequence in the set of ZC sequences comprises:
obtaining du of ith ZC sequence in the ZC sequence groupHTA value;
du according to the ith ZC sequenceHTDetermining the starting positions of N detection windows of the ith ZC sequence;
setting N detection windows of the ith ZC sequence according to the initial positions of the N detection windows and the preset size of the detection windows;
wherein du of the ith ZC sequenceHTThe value refers to when the frequency offset is positive or negativeA shift of a mirror peak of the ith ZC sequence in a power delay profile PDP with respect to the RTD, TSEQIs the time length occupied by the ith ZC sequence, and the value of i is [1, M]All of the integers of (1).
3. The method of claim 1, wherein the frequency offset range of the ultra-high speed random access isAnd when the ZC sequence group comprises M ZC sequences, delta fRAIndicating a subcarrier interval of a random access channel, wherein the setting of N detection windows for each ZC sequence in the ZC sequence group includes:
obtaining du of ith ZC sequence in the ZC sequence groupHTA value;
du according to the ith ZC sequenceHTSetting values for 5 detection windows of the ith ZC sequence;
wherein du of the ith ZC sequenceHTThe value refers to when the frequency offset is positive or negativeA shift of a mirror peak of the ith ZC sequence in a power delay profile PDP with respect to the RTD, TSEQIs the time length occupied by the ith ZC sequence, and the value of i is [1, M]All of the integers of (1).
4. The method of claim 3, wherein du of the i-th ZC sequence is a function ofHTSetting 5 detection windows of the ith ZC sequence to include:
du according to the ith ZC sequenceHTObtaining the starting positions of 5 detection windows of the ith ZC sequence;
the detection window comprises 5 detection windows, namely a detection window I, a detection window II, a detection window III, a detection window IV and a detection window IV;
the initial position of the detection window I is 0;
the start position of the detection window ② is mod (du)HT，Nzc)；
The start position of the detection window ③ is mod (-du)HT，Nzc)；
The start position of the detection window ④ is mod (2 × du)HT，Nzc)；
The start position of the detection window ⑤ is mod (-2 × du)HT，Nzc)；
Nzc is the length of the ith ZC sequence;
and setting 5 detection windows of the ith ZC sequence according to the initial positions of the 5 detection windows of the ith ZC sequence and the preset size of the detection window.
5. The method of claim 3, wherein the step of removing the substrate comprises removing the substrate from the substrateIn that du of the ith ZC sequenceHTAll values satisfy the condition
Such that 5 detection windows of the ith ZC sequence do not overlap;
wherein Ncs in the condition is the first Ncs, and Nzc is the length of the ith ZC sequence.
6. The method according to any of claims 1-5, wherein said detecting valid peaks in N detection windows of each ZC sequence, determining an estimated value of a round trip delay, RTD, according to the valid peaks comprises:
detecting a main peak in the effective peaks in N detection windows of each ZC sequence;
determining a search window of a secondary peak value in the effective peak values according to the detection window where the primary peak value is located;
detecting a secondary peak value in a search window of the secondary peak value, and determining an RTD estimation window according to a combination relation of a detection window where the primary peak value is located and a detection window where the secondary peak value is located;
and determining the estimated value of the RTD according to the position of the effective peak value in the RTD estimation window.
7. The method of any of claims 1 to 5, wherein determining the estimated RTD from the valid peak comprises:
determining an RTD estimation window according to the detection window where the effective peak value is located;
and determining the estimated value of the RTD according to the position of the effective peak value in the RTD estimation window.
8. The method of claim 7, wherein determining the RTD estimation window based on the detection window in which the valid peak is located comprises:
if the detection window of the ZC sequence where the effective peak value is located is not overlapped with other detection windows of the ZC sequence, one of the detection windows where the effective peak value is located is selected as an RTD estimation window; or
If the detection window of the ZC sequence where the effective peak value is located is overlapped with other detection windows of the ZC sequence, but at least one effective peak value appears in a non-overlapped part, determining the detection window where the at least one effective peak value is located as an RTD estimation window; or
If the detection window of the ZC sequence where the effective peak value is located is overlapped with other detection windows of the ZC sequence, and the effective peak value appears in the overlapped part, determining that the random access signal is not detected in the detection window where the effective peak value is located, or performing frequency offset processing on the random access signal according to the frequency offsets of two detection windows where the main peak value is located in the effective peak value to obtain a new effective peak value, and determining a frequency offset and an RTD estimation window according to the new effective peak value.
9. The method according to any one of claims 1 to 5, further comprising:
and carrying out frequency offset estimation according to the detection window where the effective peak value is located.
10. An ultra-high speed random access processing apparatus, comprising:
a selecting unit, configured to select a Zadoff-Chu, which is a ZC sequence group, according to a cell type and a first cyclic shift parameter Ncs;
the setting unit is used for setting N detection windows for each ZC sequence in the ZC sequence group selected by the selection unit, wherein N is more than or equal to 5;
a sending unit, configured to send the cell type, the second Ncs, and the ZC sequence group selected by the selecting unit to user equipment UE, so that the UE selects a random access sequence in the ZC sequence group;
a receiving unit, configured to receive a random access signal sent by the UE, and obtain the random access sequence from the random access signal;
and the detection unit is used for performing correlation processing on the random access sequence acquired by the receiving unit and each ZC sequence in the ZC sequence group respectively, detecting effective peak values in N detection windows set for each ZC sequence by the setting unit, and determining an estimated value of the RTD (round trip delay) according to the effective peak values.
11. The apparatus as claimed in claim 10, wherein when the ZC sequence group selected by the selecting unit includes M ZC sequences, the setting unit is further configured to:
obtaining du of ith ZC sequence in the ZC sequence groupHTA value;
du according to the ith ZC sequenceHTDetermining the starting positions of N detection windows of the ith ZC sequence;
setting N detection windows of the ith ZC sequence according to the initial positions of the N detection windows and the preset size of the detection windows;
wherein du of the ith ZC sequenceHTThe value refers to when the frequency offset is positive or negativeA shift of a mirror peak of the ith ZC sequence in a power delay profile PDP with respect to the RTD, TSEQIs the time length occupied by the ZC sequence, and the value of i is [1, M]All of the integers of (1).
12. The apparatus of claim 10, wherein the frequency offset range of the ultra-high speed random access isAnd when the ZC sequence group selected by the selecting unit includes M ZC sequences, the setting unit is further configured to:
acquiring ith ZC sequence in the ZC sequence groupduHTA value;
du according to the ith ZC sequenceHTSetting values for 5 detection windows of the ith ZC sequence;
wherein du of the ith ZC sequenceHTThe value refers to when the frequency offset is positive or negativeA shift of a mirror peak of the ith ZC sequence in a power delay profile PDP with respect to the RTD, TSEQIs the time length occupied by the ZC sequence, and the value of i is [1, M]All of the integers of (1).
13. The apparatus of claim 12, wherein the setting unit is further configured to:
du according to the ith ZC sequenceHTObtaining the starting positions of 5 detection windows of the ith ZC sequence;
the detection window comprises 5 detection windows, namely a detection window I, a detection window II, a detection window III, a detection window IV and a detection window IV;
the initial position of the detection window I is 0;
the start position of the detection window ② is mod (du)HT，Nzc)；
The start position of the detection window ③ is mod (-du)HT，Nzc)；
The start position of the detection window ④ is mod (2 × du)HT，Nzc)；
The start position of the detection window ⑤ is mod (-2 × du)HT，Nzc)；
Nzc is the length of the ith ZC sequence;
and setting 5 detection windows of the ith ZC sequence according to the initial positions of the 5 detection windows of the ith ZC sequence and the preset size of the detection window.
14. The apparatus of claim 12, the selecting unit further configured to:
judging the selectedDu of ZC sequences in ZC sequence groupHTWhether the value satisfies the condition
Ncs in the conditions is the first Ncs, Nzc is the length of the ZC sequence;
if there is du of at least one ZC sequence in the selected ZC sequence groupHTIf the value does not meet the condition, reselecting a ZC sequence group according to the cell type and the first Ncs;
if du of the ZC sequences in the selected ZC sequence groupHTAnd if the values all meet the condition, sending the selected ZC sequence group to the setting unit and the sending unit.
15. The device according to any one of claims 10 to 14, wherein the detection unit is further configured to:
detecting a main peak value in the effective peak values in N detection windows of each ZC sequence in the ZC sequence group;
determining a search window of a secondary peak value in the effective peak values according to the detection window where the primary peak value is located;
detecting a secondary peak value in a search window of the secondary peak value, and determining an RTD estimation window according to a combination relation of a detection window where the primary peak value is located and a detection window where the secondary peak value is located;
and determining the estimated value of the RTD according to the position of the effective peak value in the RTD estimation window.
16. The device according to any one of claims 10 to 14, wherein the detection unit is further configured to:
determining an RTD estimation window according to the detection window where the effective peak value is located;
if the detection window of the ZC sequence where the effective peak value is located is not overlapped with other detection windows of the ZC sequence, one of the detection windows where the effective peak value is located is selected as an RTD estimation window; or
If the detection window of the ZC sequence where the effective peak value is located is overlapped with other detection windows of the ZC sequence, but at least one effective peak value appears in a non-overlapped part, determining the detection window where the at least one effective peak value is located as an RTD estimation window; or
If the detection window of the ZC sequence where the effective peak value is located is overlapped with other detection windows of the ZC sequence and the effective peak value appears in the overlapped part, determining that a random access signal is not detected in the detection window where the effective peak value is located, or performing frequency offset processing on the random access signal according to the frequency offsets of two detection windows where main peak values are located in the effective peak values to obtain a new effective peak value, and determining a frequency offset and an RTD estimation window according to the new effective peak value;
and determining the estimated value of the RTD according to the position of the effective peak value in the RTD estimation window.
17. The device according to any one of claims 10 to 14, wherein the detection unit is further configured to:
and carrying out frequency offset estimation according to the detection window where the effective peak value is located.
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US14/600,615 US9674872B2 (en) 2012-08-07 2015-01-20 Method, apparatus and system for processing very-high-speed random access
US15/601,703 US10039133B2 (en) 2012-08-07 2017-05-22 Method, apparatus and system for processing very-high-speed random access
US16/026,830 US10485031B2 (en) 2012-08-07 2018-07-03 Method, apparatus and system for processing very-high-speed random access
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